快速AVS2帧内预测选择算法

针对目前数字音视频编解码技术标准(AVS2)中帧内预测模式判断过程计算较为复杂,而如今超高清视频的普及给编解码系统带来很大压力的问题,提出了一种快速帧内预测选择算法.该算法先对最底层最小编码单元(SCU)进行预测模式删选,减少了底层SCU的计算量;再通过下层编码单元(CU)的预测模式得到上层CU的预测模式,从而减少了上层CU的计算量.实验表明,该算法对压缩效率的影响很小,并且编码时间平均下降超过15%,并可有效地降低帧内编码的复杂度.

Fast selection algorithm for intra prediction in AVS2

For Audio Video coding Standard Ⅱ(AVS2) intra-prediction mode determination process is complicated to calculate, and the popularity of ultra-high definition video put encoding and decoding system under great pressure, a kind of fast intra prediction algorithm was presented in this paper. The algorithm selected the part of the Smallest Coding Unit (SCU) prediction mode,reducing the amount of computation of the underlying SCU, and then the upper layer Coding Unit (CU) obtained the prediction mode by the lower CU prediction mode, thereby reducing the amount of computation of the upper CU. The experimental results show that the impact on the compression efficiency of the algorithm is very small, the encoding time on average decreases more than 15 percent, and can effectively reduce the complexity of intra-coding.